Packing



g 1940- w. RAUTENSTRAUCH momma Filed Feb. 20, 1932 2 Sheets-Sheet 2 Patented Aug. 6, 1940 PACKING Walter Bautenstrauch, Palisade, N. 1., assignor' to The Dorin Corporation, Union City, N. 1., a corporation of New Jersey Application February 20, 19,12, Serial No. 594,364

10 Claims.' (01. ass-s) This invention relates to packings and more particularly to fiber-containing composition packings for use in mechanical devices for the purpose of sealing joints or connections between parts which may or may not have relative move.- ment. One object of this invention is to provide .a fiber-containing composition packing which will have reduced friction when in contact with a moving part, with consequent less wear and longer life.

Another object of this invention is to provide a packing having a maximum of resilience in compression whereby, when it is in contact with a moving part, it will require a, minimum 0! adjustment to-prevent liquid or gas from escaping between the packing and the moving part.

The above and other objects will appear from the following description, appendedclaims and accompanying drawings forming a part of this specification and in which: I

Figure 1 is a longitudinal sectional view illustrating an extrusion die used for making packings according to this invention.

Figure 2 is a face elevation of the breaker used in the extrusion die.

Figure 3 is a sectional view on line 3-3 of Figure 2.

Figure 4 is a longitudinal sectional view of a length of tubular packing produced according to this invention.

Figure 5 is a view similar to Figure 4 showing the length of packing cut-into short lengths.

Figure 6 is a longitudinal sectional view illuspartitions 8 between each two adjacent openings trating apressing operation carried out on one of the pieces of packing shown in Figure 5.

Figure '7 is a longitudinal sectional view of the finished packing producedaccording to Figure 6.

Figure 8 is an end view of the packing shown in' Figure 7. 1

According to the present invention, any suitable packing composition comprising, for ex-' ample, a fibrous material, lubricant and binder, causing cohesion between the component materials with or without suitable anti-friction metal, is forced under pressure through a die having an annular outlet. Although, as stated, any suitable packing composition may be employed, I have found that by employing the lubricating packing composition constituting the subject matter of copending application Serial No. 590,311, filed February 1, l932 and comprlswiththe openings 1 in the breaker. Holes II with or without the' addition of a modifying agent and vulcanizing agent, I can secure very satisfactory results. 3

I have found that by making a fiber containing composition packing with a major portion of the fibers extending in the direction of the longitudinal axis of the bore of the packing, hereinafter referred to as the axis of the packing, that the packing possesses the qualities of minimum friction and maximum resilience and length of life. 4

In order to cause the fibers to align themselves lengthwise of the axis of the packing,'a mass of suitable packing composition is forced through an extrusion die. To effectively align the fibers during the manufacture of the packing, any suitable apparatus may be used. .The apparatus illustrated in Figures 1, 2'and 3 of the drawings has given satisfactory results.

In the particular embodiment of the apparatus illustrated in Figures 1, 2 and 3 of the drawings wherein like reference numerals designate like parts, the reference numeral 1 illustrates a press body Iiaving a press chamber 2 and a threaded extension 3 on which is threadedly secured a die holder 4. Seated againstthe "end 3 of the press body and within a central bore 5 ofthe die holder is a breaker 6 having an annular series of openings or holes I with the opposite ends of the I made V-shaped as at 9 (Fig. 3). A center hole 10 is formed in the breaker for a purpose which will presently be described.

Mounted within the die holder I between an I annular shoulder ll of the die holder and the 35 breaker 6 is an enlarged inner end 12 of a die nozzle l2 which comprises a die body 13 and a die bushing 14. Set screws l5 provide means for aligning a nozzle chamber iii of the die holder are for the, purpose of accommodating a spanner wrench for tightening the die holder 4 upon the screw-threaded extension 3. The die body l3 has a main bore 18 and an enlarged inner bore l9 providing an annular shoulder 20. The bushin it is seated in the main bore it of the die body l3 and has an enlarged annular flange 2| mounted in the bore I0 and seated'againstthe shoulder 20 ofthe die body. Thus, it is simple to unscrew the die holder 4, remove thebushing u, and 5 ing asbestos or other fibers, graphite or talc and powdered unalloyed antimony and a binder con-' sisting of rubber dissolved in a suitable solvent insert in place thereof another bushing 01' any desired size ifor making packings of different outside diameters.

Extending through the central hole In of the breaker 8 is one end of a mandrel 22 having a W screw-threaded end 23 on which is threaded a nut 24 having a conical end 25 as shown. The inner face of the nut'24 engages against one side of the breaker 6 in cooperation with the face 25 of a conical enlargement 26 of the mandrel. Extending away from the conical enlargement 26 is'a cylindrical extension 21 of the mandrel which is centrally spaced from the in-. terior wall of the bushing i4 as shown. It will be obvious that by substituting mandrels having diiferently-sized extensions 21, packings can be produced having various sizes of openings.

The die holder 4 is provided with an annular chamber 28 closed by a ring 29 having opposite holes 30, 3! by means of which the chamber 28 may be supplied with a suitable fluid heating medium, whereby the breaker a may be heated by conduction from the die holder 6 to increase the flowability and coalescing properties of the plastic mass 36 as it passes through the openings of the breaker t.

The die body I3 is also provided with an annular chamber 32 closed by a ring 33 having opposite openings M and 35 by which it may also be supplied with a suitable fiuid heating medium for a purpose similar to that of the chamber 28.

In operation, the chamber 2 is supplied with a quantity of fiber-containing composition packing material 36 which is forced under pressure through the openings l of the breaker into the chamber it of the die nozzle and out between the bushing it and mandrel extension 27.

On account of the relatively small diameter of the openings 'i'in the breaker 6, the packing composition moves through these openings at comparatively high speed and under such conditions as to cause a major portion of the fibers in the composition to align themselves lengthwise of the openings 5, due to the tendency of elonlatter.

- gated objects to move longitudinally away from an impelling force. As the composition continues beyond the breaker it passes into the die nozzle chamber 16 where the various streams of the composition issuing from the openings i move laterally toward each other and coalesce and pass out through the annular opening between the die bushing Ml and the mandrel extension 21 to form a single unitary tubular member til as illustrated in Figure 4, and having the fibers 33 thereof extending longitudinally of the axis of the tube as shown.

After the tube 37 illustrated in Figure 4 has been produced as explained, it is cut at'tiii (Fig. 5) to provide annular packings tit of any desired length. The packings til can also be produced as the packing issues from the die nozzle by means of an automatically operating cutting device arranged on or adjacent the die nozzle.

The packings 40 are preferably next subjected to a pressing operation by means of any suitable die members, such as M and 42 as illustrated in Figure-6. This pressing operation produces a finished annular packing it with accurately sized inner and outer diameters, and produces the desired beveled end faces 44. It also smooths the surface of the packing andv densifies the cient intensity to properly size the packing, but of insumcient intensity to destroy the resilience of the packing. By suitably shaped dies, the beveled faces 44 may be made at any desired angle, or the end faces may be retained fiat as shown in Figure 5.

The finished packing 43 with the fibers extending in the direction of the axis of the packing,

This press-forming operation is of sumresults in a minimum of friction between an The packing produced according to the herein disclosed method possesses both plasticity and resilience. The quality of plasticity permits the packing to be flowed or distorted as the result of pressure from the follower or gland of the stufiing box in which it is used for the purpose of making the packing perfectly fit the parts with which it engages. The longitudinal arrangement of the fibers in the packing gives the latter a maximum of resilience in compression and, therefore, the follower or gland of the stufiing box through which the force is applied to the packing to accomplish the desired result of sealing the orifice of the packing in contact with a reciprocating rod to prevent escape of liquid or gas between the rod and packing, need not be adjusted as frequently as in the case of a packing with the fibers otherwise disposed, and, therefore, the seal remains eifective for a longer period of time with a given adjustment of the follower or gland, since the resilience of this packing enables the surface of the bore of the packing to repeatedly spring back and forth toward and from the surface of the rod reciprocating therethrough, which rod in practice usually has a slightly irregular surface. As the packing thus requires less force of contact with the reciprocating piston to maintain a gas tight seal, there is less friction on the piston and the packing has longer life.

This application is a continuation-in-part of my application 519,278, filedFebruary 28, 1931.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention, and the present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the range of equivalents of the claims are therefore intended to be embraced therein.

I claim:

1. An article of manufacture comprising a dieextruded composition packing containing fibers and powdered unalloyed antimony, in which a major portion of the fibers extend in the direction of the longitudinal axis of the packing.

2. An article of manufacture consisting of a die-extruded tubular fiber-containing composition packing in which a major portion of the fibers extend in the direction of the longitudinal axis of the packing to provide in said article a maximum of resilience in compression.

3. Arr annular shaped packing consisting of a die-extruded packing composition containing metal particles and fibers, a major portion of the fibers extending in a direction substantially parallel to the bore.

4. An annular shaped packing consisting of a densified die-extruded packing composition containing metal particles and fibers, a major portion 01' the fibers extending in a direction .substantially parallel to the .bore.

5. An annular shaped packing consisting of a densified die-extruded packing composition containing metal particles and fibers, a major portionof the fibers extending in adirection substantially parallel to the bore, said packing having smooth surfaces and possessing plasticity and resilience.

6. An annular shaped packing having lubricating properties consisting of a die-extruded packing composition containing fibers, a major portion-.of said fibers extending in a direction substantially parallel to the bore of said packing. v

7 An annular shaped packing having lubricating properties consisting of a die-extruded packing composition consisting essentially of fibers, particles of a solid lubricant, metal particles and rubber, a major portion of the fibers extending in a direction substantially parallel to the bore of the packing.

8. An annular shaped packing having lubricating properties consisting of a densifled die-extruded packing composition consisting essential ly of fibers, particles of a solid lubricant, metal particles and rubber, a major portion of the fibers extending in a direction substantially parallel to the bore of the packing, said packing having smooth surfaces and possessing plasticity .and resilience.

annular shaped packing having lubricating/properties consisting of a die-extruded pack! ing composition consisting essentially of fibers, particles of a solid lubricant, powdered unalloyed antimony and rubber, a major portion of the fibers extending in a direction substantially parallel to the bore of the packing.

10. An annular shaped packing having lubricating properties consisting of a densified die-extruded packing composition consisting essentially of fibers, particles of a solid lubricant, powdered unalloyed antimony and rubber, a major portion of the fibers extending in a direction substantially parallel to the bore of the packing, said packing having smooth surfaces and possessing plasticity and resilience.

WALTER RAUTENS'I'RAUCH. 

